On ClearView models page (in the middle) there are links to how to make models in ClearView using ac3d:
http://rcflightsim.com/models.html
For ac3d, you may look at the ac3d movies here:
http://www.inivis.com/resources.html
and at ac3d tutorisl here:
http://www.inivis.com/downloads.html

If you have specific questions regarding building ClearView models, ask support at rcflightsim.com or joind the clearview developers forum and ask the question there:
http://clearviewrc.com/forum/index.php

Stefan
http://rcflightsim.com